Wall heater



FIG. 1 is a front perspective view of a wall heater, showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a side elevation view taken from the right of FIG. 1, the opposite side view being a mirror image thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a rear elevation view thereof. 

I claim, the ornamental design for a wall heater, as shown and described. 